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Aug. 25, 11925.

C. W. GREENE ET AL CONTROL OF ORDNANCE Filed Feb. 8, 1925 6 Sheets-Sheet l e, IH-Ped Brooks,

6 InVen-tos Chee-ber W. Gre en Aug. 25, 1925. i

C. W. GREENE ET AL CONTROL 0F ORDNANCE Filed Feb. 8, 1923 6 Sheets-Sheet 2 wf. w :mw M m S few/0 0W .t 4 t m a e nwd 3 e w im@ .r .menT m l J @MMT 3 JU /H b w/ M m ---i n@ L|,| w m.

Aug.. 25, 1925.

C. W. GREENE ET AL CONTROL 0F ORDNANCE Filed Feb. a, 192:5

6 Sheets-Sheet 3 Their` XT-bbomeu Aug.` Z5, 1925. h

c. w. GREENE ET AL coNTRoL'oF ORDNANGE Filed Feb, 8. 192:5

6 Sheets-Sheet 5 lr1\/en{: OPS: Chas-ter W. Greene, Alfred A. Brooks,

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Aug. 25, 1925. 1,551,386

C. W. GREENE ET AL CONTROL oF ORDNANCE Filed Feb. 8, 1923 6 Sheets-Sheei,V 6

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@hes-ter W. Greene, Alfred, A. Brook Their` Attorneg.

Patented Aug. 25, 1925.

UNITED STATES PATE CHESTER W. GREENE, 0F LYNN, MASSACHUSETTS, AND ALFRED A. BROOKS, OF WELLS- NT o1-"FICE,

VILLE, NEW Yoan, ASSIGNoRs 'ro GENERAL nLEc'rmc COMPANY, A conrona'rron 01E' NEW YORK.

CONTROL OF ORDNANCE. y

Application led February 8, 1923. Serial No. 617,723.

To all 'whom t may (zo/zwem:

Be it known that we, CHESTER W. GREENE and ALFRED A. BROOKS, citizens of the United States, residing, respectively, at' Lynn, county of Essex, State of Massachusetts, and at lVellsville, county of Allegany, State of New York, have invented certain new and useful Improvements in the Control of' Ordnance, of which thel following is .a specication.

Our invention relates to thev control of ordnance and the like, more particularly to the control of ordnance from a distance, and has for its object the provision of means whereby ordnance may be directed with accuracy and in a simple,lreliable and efficient manner. l

lVhile our invention has special application to the control of ordnance, it obviously has application in the control of various other devices, such .as searchlights, torpedo tubes, etc.

Our inventionhas particular application in systems for the control of ordnance on shipboard such, for example, as describedand claimed in a copending application of Edward M. Hewlett. and Waldo IV. Willard, Serial No. 655,358, filed August 2, 1923, assigned to the same assignee as this invention. In systems of this character the guns are directed in accordance with information received from a directing instru-y ment or director which is located in a suitable position of advantage, such as aloft. Such a system is of particular advantage when the target is below the horizon'at long ranges. or when the target is otherwise obscured from the gun. The function of the director is to generate the bearing of the target and transmit it to the gun. The director comprises a sighting device which when brought to bear on the target generates the bearing of the target with relation to a tixed base line, usually the projection on the plane of movement of the sighting device of a line passing through the director and the gun. The gun is directed on the target by moving it to a position corresponding to the position of the director, which iS accomplished by comparing their movements. Obviously, in comparing the movements of the director and gun, allowance must be made for their difference in position or parallax. Mechanism is therefore provided for automaticall introducing acorrection for parallax. T is parallax mechanism may be associated with the director so that the movements of the director are corrected for parallax, suitable rep eater systems being provided for transmitting these corrected movements of the director to the gun. The 'parallax mechanism may also be associated with the gun, in which case the actual movements of the director would be transmitted and compared with the corrected movements of the gun.

vOur invention comprehends improvements in the parallax mechanism as well as improvements in a director equipped with parallax mechanism.

In carrying out our linvention we employ two-sighting devices, with one of which is associated means for transmitting its movements in azimuth, whilewith the other is associated means for transmitting its movements in altitude. each sighting device we have provided mechanism for correcting its movements for the parallax angle between the sighting device and the receiving station so that the data transmitted gives the,l direction of the target from the receiving station.

For a more complete understanding of our invention reference should be had to the accompanying drawings, in which Figure 1 is a section view of a director embodying our invention; Fig. 2 is a section view along the line 2 2 of Fig. 1 looking in the direction of the arrows; Fig. 3 is a` Section view on the line 3 3 of Fig. 2 looking in the direcvtion of the arrows; Fig. 4is a fragmentary 1; Fi 7 is a fragmentary plan view of Fig.

6 wit the telescope removed; Fig. 8 is an enlarged section view of part of the vertical parallax mechanism shown in Fig. 1';

9 is a diagrammatic view showing the pr1nciples of the horizontal parallax mec-hanism; Fig. 10 is a representation of the tri- Ass'ociated also with.

angle solved by the horizontal parallax mechanism; Fig. 11 is a diagrammatic view showing the principles of the vertical parallax mechanism; Fig. 12 is a representation of the triangle solved by theV vertical parallax mechanism; Fig. 13 is a diagrammatic freely movable through i tal l0.

view of a modified form of our invention; Fig. 14 is a perspective view of' the triangles solved by the parallax mechanisms; Fig. 15 is a diagrammatic view of the driving mechanism for the operators platform; while Fig. 16 is a diagrammatic view of a gear train between the transmitting devices.

Referring to Fig. 1 of the drawing, in one form of our invention the director comprises a vertical pedestal or supporting member mounted upon which are concentric rotatable sleeves 11 and 12. The sleeve 11 is rotatabl mounted concentric with the vertical axis of the pedestal by ball bearings 11 and 11b and is supported on the pedestal by a ball thrust bearing 11e. Similar ball bearings 12, 12b and 12c are provided in turn :on sleevey 11 for rotatably supporting sleeve 12. The pedestal 10 is adjustedso Ias to stand normally in a vertical position so that the sleeves 11 and 12 are caused to rotate about avertical axis, this axis being the axis of pedestal 10. The sleeve 12 is provided with a bracket 13 carrying a sighting telescope 14 which is a limited range in a vertical planefindependently of sleeve 12, but is restrained against movement independent-ly of sleeve 12in a horizontal or level plane, that is, about the axisof pedes- A second bracket 15 diametrically opposite bracket 13 is also provided on sleeve 12, and mounted a second telescope 16 which has a limited freedom of movement in a horizontal plane, independently of sleeve 12, and is movable in a vertical plane or altitude independently of sleeve l2 by means of mechanism hereinafter described.

Secured to the base of the supporting pedestal 10 is a stationary annular gear 17.

Uperatively connected to this gear through a suitable gear train 1S is a driving shaft 19 .which is actuated through a spiral gearing 2O by handwheels 21 and 22. This operating mechanism consisting of the handwheels 21 and'22, shaft 19 and gear train 1S is mounted on a supporting plate 23 secured to the rotatable sleeve 11 so that upon turning the handwheels, sleeve 11 together with the operating mechanism, is caused to rotate about pedestal 10'in one direction or the other. In this manner, through an operating connectionbetween sleeve 11 and sleeve 12. telescope 14 may be moved in azimuth so as to be brought to bear on the target or point to be observed. Obviously. telescope 1G is at the same time adjusted in azimuth on the target. If necessary, telescope 16 may be given a more accurate adjust-ment in azimuth independently of sleeve 12. The spiral gearing and handwheels 21 and 22 are mounted in the top of a hollow supporting pedestal 24 secured to plate 23,

on this bracket is l 11 and sleeve 12 comprises a table like arm shlaft 19 extending centrally of the pedesta Mounted on the supporting plate 23 and interposed in gear `train 18 so as to be operated respectively at suitable low' and high speed ratios with relation to the angular movement of sleeve 11 about pedestal 10` such as 1:1 and 72:1 are two'transinitting devices 25 and 26. These transmitting devices are preferably of the type having a single phase field winding cooperating with a polycircuit armature winding. When telescope 14 is moved in azimuth by handwheels 21 and 22, the transmitting devices 25)and 26 are at the same .time rotated in their respective ratios and transmit the angular movement imparted to them to the receiving station provided at the gun. The angle transmitted, however, is not the same asv the angular movement given the telescope and differs therefrom by the amount of the parallax angle between the telescope 14 or director and the receiving station. 'lhis parallax correction is introduced through mechanism to be presently described,

forming the operating connection between sleeve 11 andy sleeve 12, by means' of which a certain angle equal to the parallax angle is either added to or subtracted from the angular movement of the sleeve 11 .in imparting the movement of sleeve 11 to sleeve 12.

The-operating connection between sleeve 3() (Figs. 2 and 3) having on one end a collar 31 mountedon suitable ball bearings carried by a bearing ring 32 which is adjustably supported' on the upper end of pedestal 10.l Extending laterally from collar 31 opposite arm 30 is a table like projection Arm so as to be maintained in a' angular relation therewith by means of coupling cross 34surrounding pedestal 10 having diametrically extending arms 35 and 36 slidably engaging respectively with the lower faces'of arm 30 and projection 33 and diametrically extending arms 37 and 3S at right angles to arms 35 and'36 slidably engaging with fthe upper `end of sleeve 11.

predetermined The operative connections with the arms of the cross each comprise two spaced rollers 39 and 40, between whichthe arm moves, one of the rollersv40 of each pair beingV mounted on a block 41 slidable in a guide 42 so as to be adjustable with relation to the other roller by means of ay set screw 43. By adjusting the set screws all lost motion between the rollers of each pair and the cooperating arm can be taken up. To facilitate the operating connections between arms 3T and 38 and sleeve 11,` a ring 44 provided with two opposite integral projectionsl or ledges 45 and 4G is secured to the upper end of the sleeve. The ledges 45 and lll() 30 is connected to sleeve 11 y 46 carry the pairs of rollers cooperating with arms 37 and 38.

The bearing ring 32 is slidably supported at its vupper end on a rectangular guide member 50 (Figs. 4 and 5) secured to pedestal 10, whereby the ring may be adjusted laterally and thus made eccentric with the vertical axis of pedestal 10. Preferably the upper end of pedestal 10 is provided with a. flange 10 and is countersunk at 105 to receive a boss on the guide 5t). The guide 50 is provided with a plurality of arc sha ed slots- 50 (Fig. 4) through which'cla-mpmg screws 50b extend into the flange 10aL so as to clamp the guide to the pedestal. This arrangement provides for convenience in adjusting the angular relation of the guide and pedestal, and to provide for accuracy of this adjustment, lub 10b is provrided on ange 10, cooperating on opposite sides of which are set screws 50 'carried by guide 50. Secured to ring 32 areftwo racks 51 and 52 positionedy on opposite sides of the guide 50 and extending parallel therewith.

Cooperating with the racks 51 and`52 are spur gears' 53 and 54 secured to a shaft 55 mounted in bearing posts 56 and 57 secured `on guide 50. \The spur gears are rotated by a central spur -gear 58 secured to shaft which meshes with a circular rack 59 formed on the periphery of a collar 60. As

shown, the teeth forming rack 59 extends around the periphery ot' collar 60 so that the collar may be rotated about the axis of pedestal 10 while being operatively connected to gear 58. i

The collar60 is slidably mounted on a cylindrical guide 61 concentric with the vertical axis of pedestal 10. The guide 61 is integral with ay cylindrical cover or casing 62 secured to sleeve 12 and enclosing the upper end thereof.

On opposite sides of the collar 60 are upwardly extending projections 63 and 64 which are pivotally connected to arms 65 and 6G. These arms extend approximately at right angles to the axis of pedestal 10 and are pivoted at their left hand ends to a suitable support 67 carried by the casing 62. The. levers are joined at their right hand ends by being pivotally connected to a cross bar 68 which carries at its center a screw G9. This screw 69 cooperates with a tapped sleeve 70 rotatably mounted but held against longitudinal movement in a cylindrical exytension 71 on the casing 62. To'the upper end of sleeve 70 is secured an v'over-hanging protecting cover or handwheel provided with a handle 73 by means of which sleeve 70 may be rotated in one direction or the other as desired.

A rod 74 secured centrally to cross bar 68 cooperates with a guide 75 secured to the casing 62 whereby the cross bar is constrained to move in a path parallel with the i tion of handwheel 72 therefore screw 69 will be moved in an upward or downward direction` as the case may be and this movement transmitted through arms 65 and 66 to the collar 60. The spur gear 58 is thus rotated and its movement transmitted through gears 53 and 54 tand racks 51 and 52 to the bearing ring 32. By thus rotating handwheel 7 2 the eccentricity of the bearing ring with relation to the pedestal 10 may be adjusted as desired and in so doing the position of the pivot point of 'arm 30 adjusted.

lThe operating connection between arm 30 and sleeve 12 comprises a rectangular slide 76 (Figs. 2 and 3) secured to the outer end of arm 30 and cooperating with a guide 77 in a radial arm 78 secured to the casing 62.

t As thus constructedit will be observed that while the exact movement of sleeve 11 is transmitted to armt30 through coupling cross 34 this movement is not transmitted to sleeve 12 in case bearing ring 32 is eccentric-with the vaxis of the pedestal because arm 30 and sleeve 12 rotate about different centers. The dilierence in the two angular movements is the correction for parallax, which is' added to or subtracted from the movement of sleeve 1l depending on the angular position of the sleeve on pedestal 10. In case ring 32 is exactly concentric with the axis of pedestal 10, asshown in the drawing, any movement applied to collar 11 is transmitted without change to sleeve 12, and the parallax correction is consequently zero.

The operation of themechanism will be more easily understood by reference to the diagrammatic*representation shown in Fig. 9. Arm 30 is represented as pivoted at a point b, located adistance form the axis a of pedestal 10 equal to the eccentricity of collar 31, and also at point c in slider 76. It will be observed that in rotatingsleeve 12 through an angle a measured from line ab, arm 30 must be rotated through an angle b which is equal to angle a plus angle c of the triangle abc.

Referring to Fig. 10, let the triangle ABC be formed by the projections on the horizontal plane of movement of telescope 14, as a plane of reference, of lines joining the director, the receiving station R. an the target F (Fig. 14). For the purpose of explanation we shall consider the director or telescope 14 as located at A. the receiving station or gun at B, and the target at C. It will be observed that the telescope must be trained through an angle A with relation to the base line AB to be directed on the target whileV from the receivingstation this angle is B. It will be observed that angle B equals angle A plus angle C. If the triangle ab@ (Fig. 9) now be made similar to triangle ABC then angl@ c will be equal to the parallax angle C and therefore the sum vof 'the angles a and 0 will be equal to the angle B. j

TheV triangle ab@ is made similar to triangle ABC by establishing the relations, angle a equals angle A, and l ABTBC Angle a is generated equal to angle A in bringing the telescope 14 to `bear on the target, the .mechanism having been initially adj usted to establish this relation. This initial adjustment may be conveniently made by arranging the apparatus such that\an' gles a and b will be zero when telescope 14 is pointed at the receiving station B. Since be and AB are fixed in length, and also of known length, the relation V l ABTBC may thus be established by adjusting the length of ab inversely in proportion to the known range lBC. This adjustment is made inI the actual apparatus shown in Flgs. 1 to 5 inclusive by moving ring 32 4 .on its Guide through the agency of hand- .wheel l2. Under actual battle conditions,

the range BC is always greater than the base line AB; therefore triangle ab@ is always similar to triangle ABC `when the above relations have been established.'

It will be observed that as the movement of sleeve 12 is continued in a counterclockwise direction, the parallax angle c will gradually increase to a maximum value, assuming a fixed range, and then gradually decrease until when (L equals 180, 1t will be zero. Should the movement of sleeve 12 be continued in a counterclockwise direction the parallax angle` c will increase fromzero in the opposite direction, so as to be subtracted from thefangle a, to a maximum value and then decrease to zero upon the completion of a revolution. It will thus be observed Athat when the target lies on the base AB extended the parallax correction is zero regardless of the range. Under these conlitions guide 77 is in alignment with guide 50.

The telescope 16 is adjusted in a vertical plane so as to be directed on the same target as telescope 14 by means of a handwheel 80 (Fig. 1) which is operatively connected through a suitable geartrain 81 to a worm 82 (Fig. 6) cooperating with a worm gear sector 83 operatively connected i to the telescope. Interposed in the connecpin 97 can be i,is51,sse y having for its center the axis 85. Cooperat-` ing With'gear sector 88 is a movable gear sector 89, 'having a radius 'equal to that of sector 88 and secured to a sleeve 90 (Figs. 1

and` 8) which is rotatably mounted in arm 84 near its lower end. Secured transversely to the right hand end ofisleeve`90`is a rectangular member 91 which forms a supporti and a guide for a rectangular slider 92. .In the left hand face of slider 92 is a slot 93 extending at right angles 'to the direction of movement of the slider. A shaft 94 extends through sleeve 90, which forms a bearing for the shaft, vand carries on its inner end an eccentric pin 95 provided wlt-h susy a rectangular slider member 95 which is wheel 96 (Fig. 1) is provided on the outer end of shaft 91 by means of which the shaft can be rotated. Secured to the right hand face of slider 92 directly opposite slot 93 is a pin 97 'provided with a suitable rectangular slider 97 which is slidably fitted in a slot 98 in a member 99 carrying the telescope. This member 99 is tubular in form and is provided with suitable ball bearings 100 and 101 for the post 102 carrying the telescope. The telescope'. is thus mounted so as to be rotatable about an axis 1,03 normal to both the axis and the line of collination of the telescope. The slot 98 extends in a direction parallel with axis 103. i

As thus constructed and arranged it will be observed that by turning handwheel 96 given any desired amount of eccentricity with relation to the axis of shaft 94 from zero to the total amount of eccentricity of pinf95. Upon movement 4of telescope 16 about its horizontal axis 85 by means of handwheel 80, it will be observed that gear sector 89, due to its cooperation with gear sector 88, causes rotation of sleeve and hence rotation of the eccentric pin 97 about the axis of sleeve 90. This rotation of pin 97 causes a slight angular adjustment of telescope 16, about its axis 85, for the parallax correction. This adjustment is concurrent with and proportional to the movement being imparted to the telescope by handwheel 80.

In the diagrammatic representation of this mechanism, shown in Fig. 11, let the triangle clef be formed by lines joining the points of intersection of the axis of pin 97, the axis of sleeve 90, and the axis 85 reslidably fitted in slot 93. A suitable handi adjusted. It will be evident that in moving the telescope through its angle of elevation d. measured between a horizontal reference line .'rj/ and support 99, the arm must be moved through this angle d plus a small Y angle f. Referring to Fig. 12, let the triangle DEF be formed by lines joining the director, a point E which is the projection of the director on a horizontal plane passing through the receiving station or gunR, and the target F. For the purpose of explanation we shall consider the receivingstation or gun as actually located at E. Obviously, the triangle DEF lies in a vertical plane,

which plane is coincident with the plane of triangle def. Also the line DE is a vertical base line of fixed and known length. Base line DE corresponds to base line AB of Fig. 10. The above description will be 'understood by referring to Fig. 14 showing the `relation of the triangles ABC and DEF lying in horizontal and vertical 'plane respectively for a typical case in which the director is located at A, the receiving station or gun at R and the target at F. Itwill be observed that the angle of elevation E at the receiving station measured from the vertical base line DE extended is equal to the angle of elevation D at the ytelescope plus the parallax angle F. Therefore, since angle d (Fig. 11) is generated equal to angle D, if the angle 7 is made equal to the parallax angle F, then the arm 84 will have generated the angle E, required to -direct a gunat E on the target F.

The operation of this parallax mechanism will be more clearly understood by refer- K ence to the modified form shown diagrammatically in Fig. 13. In this form of our invention an idler gear 104 is interposed between the gear sectors 88 and 89. This idler gear is mounted on arm 84, and by its use the movement of gear sector 89 is reversed, whereby side de is maintained parallel to reference line my in allV positions of the telescope. Angle d is therefore generated equal to angle d" and since EF Vis always greater than DE, by establishing the relation Y DE`EF triangle def DEF. But since DE and ef are fixed in value this relation can'be established by suitcan be made similar to triangle" equal to the parallax angle F and consequently the angular movement imparted to arm 84 in bringing the telescope on the target is equal to angle E. It will be observed that triangle dcf is made similar to triangle DEF 'by establishing the same relations as are established to make triangle abo (Fig. 9) similar to triangle ABC (Fig. 10).

Inthe mechanism shown in Fig. 11, however, de is parallel withthe reference line g/ only when arm 84 is normal to the reference line. At other positionsy of arm 84, triangle def is not similar to triangle'DEF, for it will be observed that in such positio'ns angle d is not generated equal to angle lD. Angle e however is generated equal to angle E,V so that triangle def will in fact be similar to a triangle DEF' (Fig. l2) in which angle DEF equals angle E. An error is thus introduced which is zero when arms 84 is at right angles to the reference line and gradually increases from this position, but since the telescope is normally maintained nearly horizontal and consequently arm 84 nearly at right angles to the reference line, this error is too small to appreciably effect the accuracy of themechanism. For long distance firing it will be observed that the telescope will be pointed practically on the horizon and consequently will lie in ,a nearly horizontal position.

Interposed in the gear train 81 so as to be operated uponmovement of handwheel are-two transmitting devices 106 and 106 preferably of the type having a single phase field winding cooperating with a polycircuit armature winding. These transmittin de vices are operated at suitable ratios` wit i the angular movement of arm 84 such as one to respectively, and thus transmit the movements of arm 84 in their respective ratios to the receiving station or gun wherelit is reproduced by suitable receiving devices (not shown). l

The telescope 16 can be ad'usted in train byy means of a handwheel 1 (Fig. 6), secured to support 99, on the, vertical'driving' shaft 107 of which is a. spur gear 108 meshing with a horizontal gear sector 109 carried 115 by the telescope. A spring pressed ball 110 v carried by the telescope is adapted to engage with recesses 111 in a cooperating member 112 on support 99 so as to holdi the telescope in its adjusted position. i

A movable platform 126 for the operators is provided surroundin the base of pedestal 10 (Fig. 1). This plat orm is in theform of a drum, having a cylindrical vertical supporting portion 127. which is provided with, a i i circular internal supporting rail 128 riding on a plurality of stationary rollers 129. The rollers 129 are spaced around the supporting rail and are mounted on a suitable base plate 0r Support 130.. A vertical guiding aange 13 with the guiding iange are a plurality of spaced vertical rollers 132 where'by the platform is constrained to move on rollers 129 concentrically with the pedestal. aperture 133 is provided in the platform through which the pedestal 24 projects.

When sleeve 12 is turned byhandles 21 and 22 the platform 126 is automatically rogear tated a like amount in the same direction so that the relative positions of the operators, and the telescopes ,remain unchanged.

The platform is 4rotated by a servo-motor driving mechanism 135 actuating a driving gear 13.6 which cooperates with an internal 137 secured concentric with pedestal 10 4to the supporting portion 127 of the platform. The platform driving mechanism 135 is secured to the base plate 130 and is controlled by a shaft 138 which is operatively connected through miter gears 139 and 140,A

shaft141land miter gears 142 and 143 to a vertical tubular driving shaft 144. This shaft 144 extends upward through the center of pedestal through guide 61 (Fig. 5) and is secured at its upper bearing 145 is provided in pedestalV 10 for Vthe lower end of shaft 144. Preferably shaft 141 is provided with two universal joints 146 and 147.

'. troller 151. The

Referring to ,Fig 16 the driving mechanism 135 comprises a servo motor 150 which is automatically controlled by follow-up mechanism `operating a suitable drum conservo motor is operatively connected through bevel gears 152 and 153, counter shaft 154, 'spur gears 155 and 156, shaft 156', and clutch 157 to the platform driving gear 136 and also to a spur gear 158. Meshing 159 secured to a shaft 160 which carries a bevel gear 161 forming one ofthe driving gears 0f a differential, the. opposite driving gear 162 of which is driven by shaft 138. A planetary pinion 163 meshes with gears 161 and 162 and is secured to a spul' gear 164y mounted on ball bearings on shaft 160. The spur` gear 164 meshes with a 'drivingn gear 165 for the controller' 151. vIn the arrangement shown, gears 136 and 158 are secured to a sleeve which -is rotatably mounted on shaft 156 and rovided on'its lower end with projections a apted to mesh with similar projections on clutch 157. Shaft 138 is tubular in form and provided with bearings for `shaft 160.

As thus arranged any movement ofV sleeve y 12 is transmitted through planetary gear 163 to the controller 151 `whereby the motor 150 is causedto operate and drive the platform in the Asame direction. The. motor at, the same time through the follow-up mechanism reviously described moves the controller ack to off position. The platform is thus g end to cover 62 so as to be-moved with sleeve 12. A balli with spur gear 158 is a spur gear maintained in a predetermined angular rela-r tion 'with sleeve 12.

Referring to Fig. 15 showing in diagrammatic form the ear train 18, under normal operating conditions the movements of shaft 19 are transmitted through gears 165, 166, 167,168 and 169, countershaft 169', gears 170, 171, countershaft 171', gears 172 and 173, countershaft 173', gears 174 andl75, countershaft 175', gears 176 and 177 to the transmitting device 25, and from countershaft 169( through gears 178 and 179 to transmitting device 26. Gears 167 and 168 are secured rigidly together, for example, on a sleeve, and are rotatably mounted on countershaft 171. Gear 180 is rotatably mounted on countershaft 17 3. and under normal operating conditions is not used. As driving shaft 19 is turned, gear 181 secured to countershaft 17 3 rotates turning gear 182 which meshes with the stationary pedestal rack 17 and thus moving the apparatus including sleeve 11 around the pedestal 10. A clutch comprising two slidable sleeves 183 and 184 mountedv on shaft 173 is provided. y,Clutch sleeve 183 is operatively connected to gear 173 by a radial arm 183'. The sleeves are operated together by means of a yoke member (note shown) in a well known manner and are provided with teeth .cooperat` ingI respectively with similary teeth or gears 174 and 180. With the clutch in the position shown in the drawing, ear 173 is connected to countershaft 173.1 When it is desired ,to move the telescope 14 rapidly through a considerable angle, for example, in shifting from one target to another, the clutch is preferably thrown to a downward position whereby gear; 174 is released and gear 180 connected to countershaft 173. The drive from shaft 19 to the turret'rack is now through gears'165, 166, and 182 which gives a lower gear ratio between shaft 19 and the pedestal rack where-f by telescope 14 5may be swung more rapidly around the stationary pedestal. At the same time it ,will/be observed ratio between 'the high `speed transmittmg device 26 and the pedestal rack is changed to a suitable low speedratio, such as 9 The widths of the clutch teeth are desi so that when the clutch is thrown from s ew- `ing position back to normal position, the high s ed transmitter is connected again in syncliionous relation with ythe telescope 14.

In operating our invention the operator for telescope 14 rotates handles 21 and 22 until this telesco ,is adjusted in azimuth on the target, w ile the operator of telescope 16 at the same timeturns handwheel 80 until his telescope is adjusted in altitude on the same target, and if neceary adjust telescope 16 through a small an 1c in azimuth by turning handwheel 107. j t some time, either before or concurrently with the adthat the operating A To facilitate this adjustment the handwheels will preferably be provided `with suitable scales cooperating with stationary pointers. The operation of the director as thus described c'auses the transmittingdevices 25` and 26 to transmit in their respective ratios the direction of the target in azimuth as viewed from the receiving station and transmitting devices 105 and 106' to similarly transmit the direction of the target in alti- 'tude as viewed from the receiving` station or gun. This lnformation 1s reproduced 1n the receiving station by suitable receiving 'devices and the desired object such as a gun,

telescope or searchlight directed in accordance with this information on the target.

In the appended claims it is to be understood that under conditions where the station, object, etc. in question is not actually located in the plane of reference, as under the conditions referred to lin the previous description. it is assumed to be located in a corresponding position in the particular plane of reference.

While we have described our invention as embodied' in concrete form and as operating in a specific manner in accordance with the provisions of the patent statutes, it should be understood that we do not limit our invention thereto, since various modifications thereof will suggest themselves to those skilled in the art wit-hout departing from the spirit of our invention, the scope of which is set forth inthe annexed claims.

What we claim as new and desire to' secure by Letters Patent of the United States, is

1. Parallax mechanism comprising a mechanical triangle having a fixed side and an adjustable side, means for adjustingl the latter and the angle opposite said fixed side so as to make said mechanical` triangle similar to a triangle formed by lines joming an observation station, a second station and a remote object, said adjustable side corresponding to a base line passing through said stations and said fixed side correspond. ing to the line joinin said second station and said object, where y the angle opposite said adjustable side is ,made equal to the parallax angle between said stations so that said adjusted angle corrected for said arallax angle gives the bearing of said object from said second station with relation to said base line. l

2. Parallax mechanism comprising a mechanical triangle having a fixed side and an adjustable side, means for adjusting the angle opposite said fixed side equal to the angle between lines joining an observation st'ation with a second station and a remote object, and means for adjusting said adjustable side in proportion to the distance between said second station and said remote object, whereby the angle opposite said adjustable side is made equal to the parallax angle between said stations so that said adjusted angle corrected for said parallax angle gives the bearing of said objectfron1 said second station withrelation to a line passing through said stations.

3. Parallax mechanism comprising a mechanical triangle having a fixed side and ali/adjustable side, means for adjusting the latter inversely in proportion to the distance between a receiving station and a remote object, means for adjusting the angle opposite said fixed side equal to the angle between lines joining a transmitting station with said receiving station and said object, whereby the angle opposite said adjustable yside is made equal to the parallax angle between said stations, and means for transmitting to said receiving station said adjusted angle corrected for said parallax angle.

4. Parallax mechanism comprising a mechanical triangle having an adjustable side of fixed direction, a side of fixed length pivotally mounted on one extremity of said adjustable side, and a side of varying length pivotallymounted on the other extremity of said adjustable side, means for swinging said side of varying length on its pivot to make the angle included with said adjustable side equal to the angle included between lines joining an observation station f with a remote object and a second station, and means for adjusting the length of said adjustable side in accordance with the distance between said second station and said object whereby the an le 'between said fixed side and said adjusta bearing of said object with relation to a line passing through said sta-tions.

5. Parallax mechanism comprising a .mechanical triangle representing a large triangle formed by lines joining an observation station, a second station, and an object, said mechanical triangle having a fixed side correspondingto the line joining the second station and object, an adjustable side corresponding to a line joining said stations, and a side of varying lengthl corresponding to the line joiningthe observation station and object, means for varying the length of said adjustable side inversely in proportion to the distance from said second station to said object, and means for adjusting the angle opposite said fixed side equal to the angle included between lines joining the observation station with said object and said second station, whereby the angle included between said fixed side 'and said adle Side indicates the 'i justable side extended indicates the bearing of said object with relation to a line passing1 through said stations.

6. Parallax mechanism Vcomprising a mechanical triangle having'a xed side and an adjustable side, meansfor adjusting the latter inversely proportion to the distancev between a receiving station and aremote object, a sighting device, an operating connection between said sighting device and said triangle whereby lthe angle opposite said fixed side is made equal to the angle between lines oining a transmitting station with said receiving station and said object by directing the sighting device on said object, and transmitting means associated with said triangle for transmitting the movement of said sig ting device corrected for parallax to said receiving station.

7. Parallax mechanism comprising a mechanica-l triangle having a fixed yside and an adjustable side, means for adjusting the latter inversely in proportion to the distance between a receiving station and an object. a sighting device, an o erating connection between said sighting evice and said trian le so that the an le opposite said fixed si e is adjusted equa to the angle between said sighting device and a base line joining a transmitting station with said receiving station byfdirecting said sighting device on said object whereby the angle opposite said adjustable side is made equal to the parallax angle -between said ations, and transmitting means associated with said trianglefor transmitting the movement of said sight-ing device corrected for said parallax angle to said `receiving station.

8. A director comprising a sighting device, a member pivoted at a point lying in a fixed direction from the axis of 'rotation of'said sighting device, an operating connection between said member ing device so that lwhen sighting device is moved about its axis said member is moved about its pivot, and means for adjusting the distance between the Vpivot of said member and the axis of said sighting device in proportion to the distance between a remote statlon and anl object so that when said sighting device is directed lon the ob` ject said pivoted, member is moved to aV sition indicating the direction of the ob- ]ect from said remote station.

9. A director comprising a sighting device, an arm axis parallel with the axis of said sighting devi, a pin and slot connection between' the other end of said arm and said sight mg device, and means lfor adjusting the distance between the pivot of said arm and the axis of said sighting device inversely in proportion to the distance between a remote station'and an object so that when said sighting device'isfdirected on said obvert-ical axis,

and said sightpivoted at one end about an i supporting pedestal,

ject said arm is caused to generate an angle with relation to a line passingV through its pivot and the axis of said sighting device giving the bearing of said object from said remote stationwith relation to a line passing through said sighting device and remote station.

`10. A director comprising a sighting device, a rotatable support therefor, a member target so that when said lsighting device is directed on said'target said first rotatable member is caused to describe an angle giving the direction .of said target from said remote station.

11. A director comprising a sighting device, a support therefor rotatable about a a member rotatable about the axis of said support, an adjustable bearing eccentric with the axis of said support, an arm pivoted on said bearing and operatively connected to said rotatable member so as to be maintained in a predetermined angular relation therewith, an, operating connection between said arm and said support, and means for adjusting the eccentricity of said bearing inversely in proportion to the distance between a remote' sta tion and a tar t, so that when said. sighting device is irected onl said target said rotatable member is caused to describe. an angle giving the bea-ring of said target from said remote point with reference to a base line passing through the director and said remote point.

12. A director comprising a stationary supporting pedestal, a. sleeve rotatably mounted on said pedestal, a support roto said sleeve corrected for parallax between said director and a remote receiving station,

and means for transmitting the movements lof said sleeve to said receiving station.

13. A director comprising a stationary a lsleeve rotatably mounted on said pedestal, a support rotatably mounted on said sleeve, said sleeve and said support having a common axis of rotation, a member rotatable about an axis parallel with said common axis, an operatrotatable .member and the` axis of said support in proportion to the distance between a remote station and a1 lll ing connection between said member and said sleeve whereby said member 1s maintained in a predetermined angular relation with said sleeve, an operating connection between said member and said support, a

10 said common axis in proportion to the distance between a remote station and a. target So thatrwhen said sighting device is directed on said target said sleeve is caused to describe an angle giving the bearing of said target from said remote station.

In witness whereof, CHESTER W. GREENE has hereunto set his hand this 25th day of January 1923, and ALFRED A. BROOKS has hereunto Set his hand this 2nd day of F ebruary 1923. t

CHESTER W. GREENE.

s ALFRED A. BROOKS. 

